upgrade from 10.15.2: update clover to 5102, update kexts using built-in updater in clover, then 3 reboots.
In the 1st reboot, clover choose 'xxx - Data', which works well;
in the 2nd reboot, clover didn't choose 'xxx - Data', which is wrong, so I manually choose 'xxx - Data';
In the 3rd reboot, there is only one choice left, which will finish the last part.
Everything works great!